In this work, a metasurface with the symmetrical double C-shaped narrow ring connected with the central cross structure is investigated by simulation, theory and experiment, which can near-perfectly convert linearly polarized electromagnetic waves into their orthogonal components in the frequency ranges from 9.38 to 13.36 GHz and 14.84 to 20.36 GHz. And the corresponding fractional bandwidths within the two bands are 35.00% and 31.36%, respectively. The influences of structural parameters on the polarization conversion performance are studied. The results show that the central frequencies and bandwidths of the two bands can be easily modulated by varying the structural parameters of r and θ. The high-efficiency and dual-broadband characteristics can also be well maintained in the oblique incidence range of 0–45°. Meanwhile, the mechanisms of polarization conversion are analysed, and several formulas are used to calculate the reflection coefficients of the co- and cross-polarization under the normal incident y-polarized electromagnetic waves based on the phase difference of the reflection coefficients of the u- and v-polarized conversions. The experiment results are in good agreement with those of simulations and theoretical analysis. The proposed metasurface has important applications in novel polarization control devices.

中文翻译：

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基于各向异性超表面的双带宽线偏振转换器

在这项工作中，通过模拟、理论和实验研究了具有对称双 C 形窄环与中心十字结构连接的超表面，该超表面可以近乎完美地将线性极化电磁波转换为频率范围为 9.38 的正交分量。至 13.36 GHz 和 14.84 至 20.36 GHz。两个频段内相应的分数带宽分别为 35.00% 和 31.36%。研究了结构参数对偏振转换性能的影响。结果表明，通过改变 r 和 θ 的结构参数，可以很容易地调制两个频段的中心频率和带宽。在0-45°的斜入射范围内也能很好地保持高效率和双宽带特性。同时，分析了偏振转换的机理，根据u-和v反射系数的相位差，用几个公式计算了法向入射y-偏振电磁波下的同偏振和交叉偏振的反射系数。 -极化转换。实验结果与模拟和理论分析的结果吻合较好。所提出的超表面在新型偏振控制器件中具有重要应用。实验结果与模拟和理论分析的结果吻合较好。所提出的超表面在新型偏振控制器件中具有重要应用。实验结果与模拟和理论分析的结果吻合较好。所提出的超表面在新型偏振控制器件中具有重要应用。